Bump ujson from 5.4.0 to 5.5.0

Bumps [ujson](https://github.com/ultrajson/ultrajson) from 5.4.0 to 5.5.0.
- [Release notes](https://github.com/ultrajson/ultrajson/releases)
- [Commits](ultrajson/ultrajson@5.4.0...5.5.0)

---
updated-dependencies:
- dependency-name: ujson
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -6,6 +6,6 @@ Cython==0.29.32
 cyvcf2==0.30.16
 uvloop==0.16.0
 aiocache==0.11.1
-ujson==5.4.0
+ujson==5.5.0
 Authlib==1.0.1
 gunicorn==20.1.0

setup.py

@@ -46,7 +46,7 @@
         "uvloop==0.16.0",
         "cyvcf2==0.30.16",
         "aiocache==0.11.1",
-        "ujson==5.4.0",
+        "ujson==5.5.0",
     ],
     extras_require={
         "vcf": [